<!--
  Copyright 2020 The Chromium Authors. All rights reserved.
  Use of this source code is governed by a BSD-style license that can be
  found in the LICENSE file.
-->
<html>
<body>
    <script>
        let audioContext;
        try {
            audioContext = new AudioContext();
        } catch (e) {
            alert('Web Audio API is not supported in this browser');
        }
    </script>
</body>
</html>